Enhancement of the electrocatalytic O2 reduction on Pt–Fe alloys

Toda, Takako; Igarashi, Hiroshi; Watanabe, Masahiro

doi:10.1016/s0022-0728(98)00361-1

Cited by 439 publications

(344 citation statements)

References 13 publications

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“…Enhanced electrocatalytic activity in the reduction of oxygen was shown on several Pt-3d alloy surfaces, particularly Pt-Fe and Pt-Ni, compared to that of pure Pt. 11 In that work, Toda et al suggest that adsorption of O 2 is the rate-determining step, and that alloying results in an enhanced metal-oxygen interaction that leads to an increased coverage of O 2 Ϫ , which subsequently dissociates. However, it has been shown that reducing the dissociative adsorption energy of oxygen results in an increase in the oxygen dissociation barrier.…”

Section: B H 2 and O 2 Dissociative Adsorption Energiesmentioning

confidence: 99%

“…15 Toda et al have reported, however, that in many of the Pt-3d systems they have investigated that the alloy particles are covered by a thin skin of Pt, even under hot H 3 PO 4 reaction conditions and in the electrocatalytic reduction of O 2 . 11 Clearly, there are nontrivial issues to be understood on the effects of surface segregation under reaction conditions, but this topic is beyond the scope of this paper.…”

Section: Introductionmentioning

confidence: 99%

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Modification of the surface electronic and chemical properties of Pt(111) by subsurface 3d transition metals

Kitchin¹,

Nørskov²,

Barteau³

et al. 2004

The Journal of Chemical Physics

1,251

1,016

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The modification of the electronic and chemical properties of Pt͑111͒ surfaces by subsurface 3d transition metals was studied using density-functional theory. In each case investigated, the Pt surface d-band was broadened and lowered in energy by interactions with the subsurface 3d metals, resulting in weaker dissociative adsorption energies of hydrogen and oxygen on these surfaces. The magnitude of the decrease in adsorption energy was largest for the early 3d transition metals and smallest for the late 3d transition metals. In some cases, dissociative adsorption was calculated to be endothermic. The surfaces investigated in this study had no lateral strain in them, demonstrating that strain is not a necessary factor in the modification of bimetallic surface properties. The implications of these findings are discussed in the context of catalyst design, particularly for fuel cell electrocatalysts.

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Section: B H 2 and O 2 Dissociative Adsorption Energiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of the surface electronic and chemical properties of Pt(111) by subsurface 3d transition metals

Kitchin¹,

Nørskov²,

Barteau³

et al. 2004

The Journal of Chemical Physics

1,251

1,016

View full text Add to dashboard Cite

show abstract

“…Various Pt based alloys have been explored for decades with the goal to achieve high orr activities [2][3][4][5][6][7][8][9][10][11]. Other catalyst architectures referred to as core-shell, surface strained and Pt enriched catalysts have also been suggested [6,7,[12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Other catalyst architectures referred to as core-shell, surface strained and Pt enriched catalysts have also been suggested [6,7,[12][13][14][15][16][17]. Increases in mass and specific orr activities of such catalysts over Pt-only catalysts have been reported.…”

Section: Introductionmentioning

confidence: 99%

Ordered alloy formation for Pt3Fe/C, PtFe/C and Pt5.75Fe5.75Cuy/CO2-reduction electro-catalysts

Chen

Bock

Mercier

et al. 2012

Electrochimica Acta

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10. 1016/j.electacta.2012.05.103 Electrochimica Acta, 77, pp. 212-224, 2012-06-09 Ordered alloy formation for Pt3Fe/C, PtFe/C and Pt5.75Fe5.75Cuy/CO2-reduction electro-catalysts Chen, L.; Bock, C.; Mercier, P. H. J.; Macdougall, B. R. alloy structure. The activity towards the orr was measured after 70 potential cycling, which can cause beneficial changes to the catalysts. In case of the specific orr activity, a dependence on the catalyst series is observed as follows:

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“…Numerous studies have shown that platinum-based binary electrocatalysts such as PtFe, PtCo, PtNi, and PtCr exhibit a higher catalytic activity for the ORR in acid electrolytes than pure platinum [47][48][49][50][51][52][53]. For alcohol oxidation, Pt-based bimetallic catalysts were also developed in order to increase the anode activity and selectivity [54][55][56][57].…”

Section: Ii2 New Preparation Methods Of Efficient Electrode Catalystsmentioning

confidence: 99%

Do not forget the electrochemical characteristics of the membrane electrode assembly when designing a Proton Exchange Membrane Fuel Cell stack

Lamy

Jones

Coutanceau

et al. 2011

Electrochimica Acta

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International audienceThe membrane electrode assembly (MEA) is the key component of a PEMFC stack. Conventional MEAs are composed of catalyzed electrodes loaded with 0.1-0.4 mgPt cm−2 pressed against a Nafion® membrane, leading to cell performance close to 0.8 W cm−2 at 0.6 V. Due to their limited stability at high temperatures, the cost of platinum catalysts and that of proton exchange membranes, the recycling problems and material availability, the MEA components do not match the requirements for large scale development of PEMCFs at a low cost, particularly for automotive applications. Novel approaches to medium and high temperature membranes are described in this work, and a composite polybenzimidazole-poly(vinylphosphonic) acid membrane, stable up to 190 ◦C, led to a power density of 0.5 W cm−2 at 160 ◦C under 3 bar abs with hydrogen and air. Concerning the preparation of efficient electrocatalysts supported on a Vulcan XC72 carbon powder, the Bönnemann colloidal method and above all plasma sputtering allowed preparing bimetallic platinum-based electrocatalysts with a low Pt loading. In the case of plasma deposition of Pt nanoclusters, Pt loadings as low as 10 g cm−2 were achieved, leading to a very high mass power density of ca. 20 kW g−1 Pt . Finally characterization of the MEA electrical properties by Electrochemical Impedance Spectroscopy (EIS) based on a theoretical model of mass and charge transport inside the active and gas diffusion layers, together with the optimization of the operating parameters (cell temperature, humidity, flow rate and pressure) allowed obtaining electrical performance greater than 1.2 W cm−2 using an homemade MEA with a rather low Pt loading

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Enhancement of the electrocatalytic O2 reduction on Pt–Fe alloys

Cited by 439 publications

References 13 publications

Modification of the surface electronic and chemical properties of Pt(111) by subsurface 3d transition metals

Modification of the surface electronic and chemical properties of Pt(111) by subsurface 3d transition metals

Ordered alloy formation for Pt3Fe/C, PtFe/C and Pt5.75Fe5.75Cuy/CO2-reduction electro-catalysts

Do not forget the electrochemical characteristics of the membrane electrode assembly when designing a Proton Exchange Membrane Fuel Cell stack

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